LATIN DICTIONARYLexicon Latīnum
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“spike” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

spike s.
An ear of corn, etc., spica.
A long nail, *clavus spicatus.
A javelin, spiculum.
A kind of lavender, lavandula spica (Linn.).
spike v.
spicare: spiculare. To spike cannon, *tormenta clavis adactis inutilia reddere.

Quick answer

What is the Latin word for spike?
The usual Latin words for “spike” are spīca, spīculum. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.